Improvement in steam-generators



UNITED STATES HENRY O. SERGEANT,

OF COLUMBUS, OHIO.

IMPROVEMENT IN STEAM-G EN ERATORS.

Specification forming part of Letters Patent No. 49,556, dated August22, 1865.

To all whom t may concern.-

Beit known that l, HENRY O. SERGEANT, of the city of Columbus and theState of Ohio, have invented a new and Improved Mode of ConstructingSteam-Boilers; and I do hereby declare that the following is a full andexact description of the same, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon.

The nature of my invention eonsistsin placing sheets of metal,cylinders, or tubes around the fire-surface of boilers, so arranged thatthe circulation will carry the water up along the fire-surface muchhigher than that on the outside of the sheet or metal cylinder, as shownin Figure l, but, as shown in Fig. 2, much higher on the outside thaninsidef` By this arrangement the tire-surface will always be coveredwith water as long` as there is any above the lower edge ofthe sheet,cylinder, or tubes around the fire-surface and heat enough to producethe circulation; also, the circulation is so great that the sides of themetal and tire-snrface are scoured, and kept perfectly clean, free fromlime or sediment. y

To enable others skilled in the art to construct and use my invention, Iwill proceed to describe its construction.

Fig. l represents a vertical cross-section of a vertical boiler. Fig. 2represents a vertical cross-section ofa common cylinder-boiler,show inghow the improvement can be. used in different forms of boilers.

Letters A A in Fig. l represent the lire-box; B, the fire line throughwhich the heat und smoke pass from the fire-box.

O O represent the cylinder or casing placed around the fire-box,fastened with set-screws at the top and bottom, or otherwise, with aspace at the bottom to admit of the tlow of water and steam upward.

D D represent the outside shell of the boiler.

E E represent the tube or cylinder placed around the fire-line, withopenings bottom and top the same as around the fire -boX, for thepassage of water. For ordinary purposes one tire-flue may be sufficient,but, if found advantageous, several may be used, with theimprovementattached to all.

F F represent the crown-sheetof the fire-box.

G G G represent three gage-cocks, the upper one with a tube attached,passing over and down upon the crown-sheet, for the purpose of showingwhen the circulation has begun. The two lower ones show the properheight of the water outside of the cylinder or casing around thetire-box. The dotted line is intended to represent the water-line. Fig.2, showing a section of cylinder-boiler with furnace below, representsthe tire-line up above the water-line, (which is the dotted line;) butas soon as the re is started the water will pass up between the insideeasing and the boiler and How over at the top and continue to iiow,being supplied iu the middle, at the bottom, with water from inside thecasing.

The operation is very simple. After the boiler has been supplied withwater up to the second gage the tire can he started, which will causethe water to iiow up between the casing O and the lire-box A,fallingover onto the crownsheet F. As soon as this has been covered the casingaround the fire-flue will pick it up and pass itin small particles uparound the fire-line, keeping it in contact with the heated surfaceuntil the greatest amount ofthe water will be turned into steam. rIheheight of the water on the outside of the cylinder has nothing to dowith keeping the lire-surface covered. As long as the lower edge of thecasingis covered with water so long will the tire-surface be covered.When there is heat enough to injure the iron in the boiler there is heatenough to keep up the circulation.

What l claim, and desire to secure by Let ters Patent, is-

l. The combination of the metal cylinder or casing around thefire-surface with the tirebox and a reservoir for a body of water uponthe crown-sheet.

2. The combination of the fire-line and casing around it, when soarranged as to receive the water from the reservoir on the crownsheetand convey it upward in contact with the ue.

HENRY O. SERGEANT.

Witnesses JOHN S. HoLLINGsHEAD, JOHN S. HoLLiNGsHEAD, Jr.

